My Bella has been dragging her bum since I brought her home. She had been dewormed...supposedly, her health records indicated it, and also when we took her to the vet, he said she shold be fine but gave us 2 pills just incase. I gave her one already, but the onther one is scheduled for FEb 27th. I keep looking in her poop also, but there is no sign of anything...could this just be an itchy BUM???